成形铣刀斜向铲磨用砂轮截形的计算

1　砂轮截形的计算加工汽轮机叶片用叶根铣刀要求精度高、耐磨损且能多次重复使用。该铣刀齿形的轴向截形如图1所示。图中Ａ2 Ｂ及ＩＪ两段直线垂直于Ｘ轴 ,若采用普通铲磨法加工刀具齿形 ,则在该两段直线处不能形成侧后角 ,刀具用于切削时将首先在此处磨钝 ,即产生“勒刀”现象。若采用分段铲磨方法 ,即先铲磨Ａ2 Ｂ和ＩＪ段之外的曲线 ,再斜向铲磨这两段直线 ,虽可保证前刃面齿形 ,但在重磨后齿形将发生改变 ,影响零件加工精度。若采用整体斜向铲磨法 ,则ＨＧ直线段的尺寸难以控制。为解决这一问题 ,在实际生产中可采用修形砂轮辊子对Ａ～…     

最小距离拟合方法在铲齿砂轮截形修磨中的应用

最小距离拟合方法在铲齿砂轮截形修磨中的应用湖北工学院（４３００６８）刘鹄然１．引言对于给定的几个数据点（Ｘｉ，ｙｉ），ｉ＝ｌ，２，…，ｎ用一条包含若干参变量的曲线ｆ（ｘ）进行拟合，根据最小二乘原理，通常是令：取极小，从而求出对应最佳参变量。但采用这种...     

加工铲齿铣刀成形砂轮的计算机辅助设计

在分析铲齿铣刀加工工艺及工件、铣刀、砂轮三者关系的基础上，介绍了在AutoCAD R14环境下，利用内嵌的AutoLISP语言，二次开发的铲齿成形铣刀铲磨用的成形砂轮截形CAD系统。系统主要包括工作端面廓形输入模块、铣刀廓形生成模块、铲磨用成形砂轮截形生成模块、铲磨干涉检验模块及用于修整成形砂轮的NC指令生成模块等。     

前角为α的成形铣刀铲磨用砂轮轴向截形计算新方法

本文把单参数曲面族的包络面问题转化为初等函数的计算问题，由此而导出的计算方法数学概念严谨，计算手续简捷，工程实用性强，便于实际工作者掌握。     

铲齿成形铣刀铲磨砂轮截形的计算机辅助设计

介绍了在AutoCADR14环境下,利用内嵌的AutoLISP语言,二次开发的成形铣刀铲磨砂轮截形CAD系统,系统包括铣刀廓形输入模块、铲磨用成形砂轮截形生成模块、铲磨干涉检验模块及用于修整成形砂轮的NC指令生成模块等。     

铲齿成形铣刀重磨误差的研究

提出了γｆ＞０的铲齿成形铣刀因重磨引起的廓形高度误差的计算方法,通过实例计算,分析了重磨误差的规律,并提出了减小重磨误差的措施。     

成形拉力及插齿刀铲磨后用砂轮的截形修正计算

本文从成形拉刀铲磨后面时砂轮截形修正出发，导出了在生产中简单实用的空间坐标法修正计算的主要公式。该计算方法对类似刀具的制造，有一定的参考价值。     

加工螺旋槽的铲齿成形铣刀的铲磨

介绍了加工螺旋槽的成形铣刀的制造工艺,并对铲磨齿形用的成形砂轮截形设计方法进行了分析,介绍了在ＡｕｔｏＣＡＤＲ１４环境下,利用内嵌的ＡｕｔｏＬＩＳＰ语言,二次开发的成形铣刀铲磨砂轮截形ＣＡＤ系统。     

加工螺旋槽的铲齿成形铣刀的铲磨

介绍了加工螺旋槽的成形铣刀的制造工艺,并对铲磨齿形用的成形砂轮截形设计方法进行了分析,介绍了在AutoCADR14环境下,利用内嵌的AutoLISP语言,二次开发的成形铣刀铲磨砂轮截形CAD系统.     

Study on precision grinding of screw rotors using CBN wheel

With increasing demands for high-speed and high-precision machining technology, CBN shape grinding is an effective means in the field of precision machining for screw rotors. Aiming at the high precision machining of screw rotors, a mathematical model for the axial profiles of the CBN wheel for machining screw rotors is developed based on theory of gear engagement. Small electroplated CBN wheel is firstly used to grinding screw rotors. Taking the backlash of screw rotors and the coating thickness of CBN layer into consideration, the modification of the base body of the wheel shape is introduced into the design of CBN wheel. For reducing the tooth profile errors of screw rotors induced by mounting errors and wears of CBN wheel, a mathematical model of the error analyses is established and the influence curves of the profile errors affected by mounting errors and radius error of grinding wheel are proposed. The electroplated CBN wheels for the screw rotors are made to verify the validity and effectiveness of the presented method and the machining experiments were performed. Results of this study reveals that the method proposed in this paper can be used as the precision grinding of screw rotors.     

A precision grinding method for screw rotors using CBN grinding wheel

Aiming at the high precision machining of screw rotors, a new grinding method for screw rotors using cubic boron nitride (CBN) grinding wheel is presented in this paper. Small electroplated CBN grinding wheel is firstly used to grind screw rotors. The mathematical model for the axial profiles of CBN grinding wheel is developed based on gear engagement theory. Taking the backlash of screw rotors and the coating thickness of CBN layer into consideration, the modification of the base body of the wheel shape is introduced into the design of the CBN grinding wheel. Wire cut electrical discharge machining low speed (WEDM-LS) was used to machine the base body of the CBN grinding wheel. The formed turning tools of the base body of CBN grinding wheel using WEDM-LS and the wheel shapes of CBN grinding wheel using the formed turning tool were performed. The CBN grinding wheels for the screw rotors were made to verify the validity and effectiveness of the presented method. The electroplated CBN grinding wheels were used to machine the screw rotors, and the machining experiments were performed. The data obtained in the experiments reach the fifth class of Chinese Standard GB10095-88.     

Research on the technology for outer race elliptical groove grinding with basin-like grinding wheel

A new grinding method that outer race elliptic track in ball basket constant velocity joint is ground by means of basin-like grinding wheel is proposed herein. Aiming at the grinding process with basin-like grinding wheel, the paper establishes the mathematical model, optimizes the parameters by using restrictive random direction method, studies the processing principle in detail, and analyzes the machining errors. The simulation results indicate that the theoretical error of elliptical groove ground by basin-like wheel will be reduced to the level of 0.001 mm. Then, the grinding experiments of elliptical grooves with the basin-like grinding wheel were completed, and the measurements of the grooves by portable arm coordinate measuring machine were carried out, which validates the feasibility of this grinding technology.     

陶瓷结合剂CBN砂轮高速磨削凸轮轴的表面粗糙度研究

本文通过一系列的试验,分析了磨削工艺参数对工件表面粗糙度的影响,建立了磨削表面粗糙度的经验公式,研究了陶瓷结合剂CBN砂轮磨削表面粗糙度的变化规律及其特点,这些规律为凸轮轴的CBN高速磨削提供了一系列实用的工艺参数.     

Research on elliptical groove grinding for plunging constant velocity joint with basin grinding wheel

The theoretical error of elliptical groove in outer race of plunging constant velocity joint ground by finger grinding wheel is about 0.004 mm. In order to decrease the error, a new grinding method with basin grinding wheel is proposed. When we optimize the design parameters, the basin grinding wheel will avoid the problems that the feasibility and grinding accuracy are restricted by the interference of the head in the grinding process by means of finger grinding wheel, and can be used to ensure the machining precision and the sectional shape of the raceway to the greatest extent. Aiming at the grinding process with basin grinding wheel, the paper establishes the mathematical model, optimizes the parameters by using simplex algorithm, studies the processing principle in detail, and analyzes the machining errors. The simulation results indicate that the theoretical error for elliptical groove ground by basin grinding wheel will be reduced to 0.631 μm.     

打造国内高精密磨床第一品牌——访北京第二机床厂有限公司副总经理、总工程师王波

北京第二机床厂有限公司的前身是始建于1953年的原国家大型骨干企业北京第二机床厂,是我国机床制造业的十八家骨干企业之一.在半个多世纪的发展历程中,北京二机曾经成功制造出中国第一台高精度万能外圆磨床、第一台坐标镗床、第一台数控高精度外圆磨床,是中国第一家磨床系列模块化生产企业.     

磨床砂轮架设计与制造研究

就磨床的砂轮架在设计、制造、装配诸方面进行了比较详细、系统的研究与分析,揭示了磨床砂轮架中各零件之间的相互内在联系,指出了砂轮架设计、制造中如何对各种零件性能相互进行配合,从而满足不同性能的要求。     

PCD刀具精密切削产生超越性加工现象的研究

着重就PCD刀具精密切削时切削用量、刀具安装角和切削液等三个方面对超越性加工现象的影响规律进行了实验研究,得到了超越性加工现象产生的条件,对实际生产具有指导意义。